package com.rimuru.a02;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigUtils;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;

import javax.annotation.Resource;

public class TestBeanFactory {

    public static void main(String[] args) {
        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
        // bean 的定义(class,scope,初始化，销毁)
        AbstractBeanDefinition beanDefinition =
                BeanDefinitionBuilder.genericBeanDefinition(Config.class).setScope("singleton").getBeanDefinition();

        beanFactory.registerBeanDefinition("config", beanDefinition);

        // 给 BeanFactory 添加一些常用的后处理器
        AnnotationConfigUtils.registerAnnotationConfigProcessors(beanFactory);


        // beanFactory 后处理器 主要功能，补充了一些bean的定义
        for (BeanFactoryPostProcessor beanFactoryPostProcessor : beanFactory.getBeansOfType(BeanFactoryPostProcessor.class).values()) {
            // 执行 beanFactory 后处理器
            beanFactoryPostProcessor.postProcessBeanFactory(beanFactory);
        }

        // Bean 后处理器，针对bean的生命周期的各个阶段提供扩展，例如 @Autowired @Resource ...
        beanFactory.getBeansOfType(BeanPostProcessor.class).values().stream()
                .sorted(beanFactory.getDependencyComparator()).forEach(beanPostProcessor -> {
                    System.out.println(">>>>>" + beanPostProcessor);
                    beanFactory.addBeanPostProcessor(beanPostProcessor);
                });

        for (String name : beanFactory.getBeanDefinitionNames()) {
            System.out.println(name);
        }
        // 准备好所有单例对象
        beanFactory.preInstantiateSingletons();
        System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
        System.out.println(beanFactory.getBean(Bean1.class).getBean2());

        System.out.println(beanFactory.getBean(Bean1.class).getInter());
        System.out.println("internalAutowiredAnnotationProcessor" + (Ordered.LOWEST_PRECEDENCE - 2));
        System.out.println("internalCommonAnnotationProcessor" + (Ordered.LOWEST_PRECEDENCE - 3));
        /*
            学到了什么:
            a. beanFactory 不会做的事
                   1. 不会主动调用 BeanFactory 后处理器
                   2. 不会主动添加 Bean 后处理器
                   3. 不会主动初始化单例
                   4. 不会解析beanFactory 还不会解析 ${ } 与 #{ }
            b. bean 后处理器会有排序的逻辑 实现了order 接口完成的 数字越小的优先级越大
         */
    }

    @Configuration
    static class Config {
        @Bean
        public Bean1 bean1() {
            return new Bean1();
        }

        @Bean
        public Bean2 bean2() {
            return new Bean2();
        }

        @Bean
        public Bean3 bean3() {
            return new Bean3();
        }

        @Bean
        public Bean4 bean4() {
            return new Bean4();
        }
    }

    interface Inter {

    }

    static class Bean3 implements Inter {

    }

    static class Bean4 implements Inter {

    }

    static class Bean1 {
        private static final Logger log = LoggerFactory.getLogger(Bean1.class);

        public Bean1() {
            log.debug("构造 Bean1()");
        }

        @Autowired
        private Bean2 bean2;

        public Bean2 getBean2() {
            return bean2;
        }

        @Autowired
        @Resource(name = "bean4")
        private Inter bean3;

        public Inter getInter() {
            return bean3;
        }
    }

    static class Bean2 {
        private static final Logger log = LoggerFactory.getLogger(Bean2.class);

        public Bean2() {
            log.debug("构造 Bean2()");
        }
    }
}
